Electro Hardware MM1301M09-MSC Hex Standoff 4-40 1/8 in

Product Description

The ELECTRO HARDWARE MM1301M09-MSC is a male-male hex circuit board standoff designed for PCB mounting applications in electronics assembly and enclosure builds. This fastener features a 4-40 thread size on both ends, a 1/8 inch overall length, and a 3/16 inch hex width across flats. Constructed from 18-8 grade 303 stainless steel with a passivated finish, it meets the QQ-S-763 federal specification for stainless steel fasteners. The hex body shape allows installation and removal with standard hex drivers or wrench tooling, making it a reliable choice for controlled-torque circuit board stacking.

This standoff is used in residential and commercial electronics enclosures, control panel assemblies, and printed circuit board stacking configurations. It is well suited for HVAC control board brackets, electrical enclosure PCB mounts, and light-duty instrumentation assemblies where corrosion resistance and a compact footprint are required. The passivated stainless steel construction makes it appropriate for environments where mild moisture exposure or chemical contact is possible. Licensed electricians, electronics technicians, and panel builders commonly use this fastener during control board installation and replacement work.

Key Features

• 4-40 male thread on both ends for dual-side PCB stacking or standoff-to-panel mounting
• 1/8 inch overall length and 3/16 inch width across flats for compact, low-profile board spacing
• 18-8 grade 303 stainless steel construction for corrosion resistance and durability
• Passivated finish meets QQ-S-763 federal fastener specification
• Hex body shape compatible with standard nut drivers and wrenches
• Length tolerance of -0.005 to 0.005 inches for consistent fitment in precision assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit standoff for circuit board assemblies requiring 4-40 inch-series male-male hex standoffs with a 1/8 inch overall length.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians during control board mounting or panel assembly. De-energize all circuits and discharge any capacitors before working inside electrical enclosures. Use a properly sized nut driver or hex wrench to avoid rounding the hex flats. Follow applicable NEC guidelines when installing or replacing control boards within electrical panels or enclosures.